Crompton Instruments TM Series Catalog
Lightweight Shunts
TM Series
J
9
Application
This lightweight range is specifically suitable for
applications where there are space and/or weight
limitations in the installation such as in portable equipment,
compact electronic instrumentation, mobile installations
such as tanks and aircraft etc.
In addition to ammeters, shunts can be used to measure
and/or monitor current in a wide range of measurement,
protection and control devices.
The TM series lightweight shunts are manufactured to
comply with the U.S.A. military specification MIL - S161B.
Standard outputs give 50mV potential drop.
By careful design and choice of materials, it has been
possible to produce a high performance shunt which is
mechanically strong, light in weight and of extremely
compact dimensions with the ability to withstand high
overloads without damage and possessing long term
calibration stability.
Features
✔ Compact space-saving design
✔ Accuracy +/- 0.25%
✔ Insulated base mounting
✔ USA Mil. spec MIL-S-61B
✔ Temperature coefficient 0.002% per 1°C
✔ High overload withstand
Specification
Ratings : 5-1200A
Accuracy: +/- 0.25%
Outputs: 50mV or 100mV
Refer to Factory for
other outputs
Overload withstand: 1.2 x rated current
continuously
5 Second Withstand: 10-150A = 10 x rated current
151-600A = 5 x rated current
601-1200A = 2 x rated current
Temperature Co-efficient: 0.002% per °C overall
Ambient temperature: Calibrated for 20°C, they can
be used in ambient range
-20°C to +60°C
Temperature Rise: A momentary rise up to
200°C will not affect the
performance of these shunts.
When mounted as
recommended in freely
circulating air the temperature
rise should not exceed 100°C.
Maximum Load
Indicator: 20mA
The TM series is designed to
comply with U.S. military
specification MIL-S-61B. Its
performance meets all
requirements including those
covering dielectric
withstanding voltage, voltage
drop, sustained load,
overload
Construction
The end blocks are machined from solid section, high
conductivity brass. They each carry two terminals, current
connection is made by either threaded studs or bolts
depending on the model, terminals for potential lead
connection are provided by 2 screws with spring and plain
washers.
The resistance elements are made from manganin sheet
for its low temperature co-efficient and long term stability
and strength, hard soldered into slots in the end blocks.
The shunt is mounted on a high strength black phenolic
base with integral fixing holes.
Installation
The heat generated by the current is dissipated by
conduction through the busbar or cable and by convection
in the air. The shunt temperature should not exceed
145°C. Conductors must be of adequate csa and contact
surface clean and level.
Ensure clamping bolts or nuts and washers are sufficiently
tight. Shunts above 100 amps should be mounted with
leaves vertical and longitudinal axis horizontal. Where this
is impractical, forced-air cooling may be necessary to limit
the temperature to 145°C.
Potential Leads
The resistance of the leads from the potential terminals
must be taken into account when the instrument is
calibrated. Details of standard lead lengths and
resistances are available on request.
Warning
Shunts are not fully insulated and protection against
accidental contact should be provided.
Contents
Lightweight Shunts
TM Series
J
10
CATALOG AMP A B C D F G H J
No.
mm in mm in mm in mm in mm in mm in in mm mm in
TM-5-50 5 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-10-50 10 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-15-50 15 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-20-50 20 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-30-50 30 50.8 2 25.4 1 31.75 1
1
⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-50-50 50 50.8 2 25.4 1 31.75 1
1
⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-75-50 75 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-80-50 80 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-85-50 85 50.8 2 25.4 1 31.75 11⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-100-50 100 50.8 2 25.4 1 31.75 1
1
⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-150-50 150 50.8 2 25.4 1 31.75 1
1
⁄4 11.1 437 42.88 1.688 15.88 625 12.71⁄2 6.35-28
1
⁄4-28
TM-170-50 170 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-200-50 200 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-250-50 250 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-300-50 300 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-400-50 400 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-450-50 450 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-500-50 500 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-600-50 600 82.55 31⁄4 38.1 11⁄2 44.45 13⁄4 15.88 625 44.45 13⁄4 11.13 438 19.053⁄4 9.53-16 x 15.883⁄8-16 x 5⁄8
TM-800-50 800 114.3 41⁄2 54.86 2.16 63.5 21⁄2 25.4 1 53.98 2.125 14.28 562 25.4 1 12.7-13 x 22.231⁄2-13 x 7⁄8
TM-1000-50 1000 114.3 41⁄2 54.86 2.16 63.5 21⁄2 25.4 1 53.98 2.125 14.28 562 25.4 1 12.7-13 x 22.231⁄2-13 x 7⁄8
TM-1200-50 1200 114.3 41⁄2 54.86 2.16 63.5 21⁄2 25.4 1 53.98 2.125 14.28 562 25.4 1 12.7-13 x 22.231⁄2-13 x 7⁄8
50 MV
Tolerances + 0.381 mm (0.015 in) for hole diameters, other tolerances
+ 0.762 mm (0.030 in) unless otherwise noted.
Dimensions are subject to change without notice.
Dimensions
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